Mystical experiences are ineffable. This means those who experience them, cannot actually describe the way that they are actually feeling. This is like how we cannot describe aspects of our life like love.

William James- passivity

I can't control this.

Gives those privy to them an insight into the true nature of reality. States of knowledge about the way of the universe

They tare not sustained for very long. The maximum 30 mins. However, feelscan feel like they last long.